APA-viite (7. p.)

Jenkinson, C., Heffernan, C., Doll, H., Fitzpatrick, R., & Society, B. G. (2006). The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a method of imputing missing data. Oxford University Press.

Chicago-viite (17. p.)

Jenkinson, C., C. Heffernan, H. Doll, R. Fitzpatrick, ja British Geriatrics Society. The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a Method of Imputing Missing Data. Oxford University Press, 2006.

MLA-viite (9. p.)

Jenkinson, C., et al. The Parkinson's Disease Questionnaire (PDQ-39): Evidence for a Method of Imputing Missing Data. Oxford University Press, 2006.